Trump tweeted Dec. 22 that he was asking the Boeing corporation to offer a competitively priced alternative to the F-35 program, which is the current flagship fighter program of the U.S. The F-35 program is the most expensive weapons program in U.S. history, costing U.S. taxpayers nearly 400 billion dollars. Trump repeatedly expresses ire at the program’s cost overruns, and indicates he is open to radical cost-saving maneuvers. The F-35 is built by defense contractor Lockheed Martin.